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FIGURE 3. Patient with subsegmental embolisms in both lungs: mismatch defects were diagnosed by SPECT (A and B) but could not be seen on planar scans (C and D). Defects are marked by arrows in B. CT angiography found thrombotic clots in subsegmental branches of middle lobe artery (not shown) and in both lower lobe arteries (E, arrows). V = ventilation scan; Q = perfusion scan; R = right; A = anterior; L = left.

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